Data commit

Task/Stack/MATLAB/stack-1.m

@@ -0,0 +1,13 @@
+mystack = {};
+
+% push
+mystack{end+1} = x;
+
+%pop
+x = mystack{end};  mystack{end} = [];
+
+%peek,top
+x = mystack{end};
+
+% empty
+isempty(mystack)

Task/Stack/MATLAB/stack-2.m

@@ -0,0 +1,82 @@
+%This class impliments a standard LIFO queue.
+classdef LIFOQueue
+
+    properties
+        queue
+    end
+
+    methods
+
+        %Class constructor
+        function theQueue = LIFOQueue(varargin)
+
+            if isempty(varargin) %No input arguments
+
+                %Initialize the queue state as empty
+                theQueue.queue = {};
+            elseif (numel(varargin) > 1) %More than 1 input arg
+
+                %Make the queue the list of input args
+                theQueue.queue = varargin;
+            elseif iscell(varargin{:}) %If the only input is a cell array
+
+                %Make the contents of the cell array the elements in the queue
+                theQueue.queue = varargin{:};
+            else %There is one input argument that is not a cell
+
+                %Make that one arg the only element in the queue
+                theQueue.queue = varargin;
+            end
+
+        end
+
+        %push() - pushes a new element to the end of the queue
+        function push(theQueue,varargin)
+
+            if isempty(varargin)
+                theQueue.queue(end+1) = {[]};
+            elseif (numel(varargin) > 1) %More than 1 input arg
+
+                %Make the queue the list of input args
+                theQueue.queue( end+1:end+numel(varargin) ) = varargin;
+            elseif iscell(varargin{:}) %If the only input is a cell array
+
+                %Make the contents of the cell array the elements in the queue
+                theQueue.queue( end+1:end+numel(varargin{:}) ) = varargin{:};
+            else %There is one input argument that is not a cell
+
+                %Make that one arg the only element in the queue
+                theQueue.queue{end+1} = varargin{:};
+            end
+
+            %Makes changes to the queue permanent
+            assignin('caller',inputname(1),theQueue);
+
+        end
+
+        %pop() - pops the first element off the queue
+        function element = pop(theQueue)
+
+            if empty(theQueue)
+                error 'The queue is empty'
+            else
+                %Returns the first element in the queue
+                element = theQueue.queue{end};
+
+                %Removes the first element from the queue
+                theQueue.queue(end) = [];
+
+                %Makes changes to the queue permanent
+                assignin('caller',inputname(1),theQueue);
+            end
+        end
+
+        %empty() - Returns true if the queue is empty
+        function trueFalse = empty(theQueue)
+
+            trueFalse = isempty(theQueue.queue);
+
+        end
+
+    end %methods
+end

Task/Stack/MATLAB/stack-3.m

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+>> myLIFO = LIFOQueue(1,'fish',2,'fish','red fish','blue fish')
+
+myLIFO =
+
+	LIFOQueue
+
+>> myLIFO.pop()
+
+ans =
+
+blue fish
+
+>> myLIFO.push('Cat Fish')
+>> myLIFO.pop()
+
+ans =
+
+Cat Fish
+
+>> myLIFO.pop()
+
+ans =
+
+red fish
+
+>> empty(myLIFO)
+
+ans =
+
+     0